Home Explore Help
Register Sign In
devn00b
/
EQ2EMu
9
3
Fork 0
Files Issues 59
Tree: ff02b05cfd
Branches Tags
EQ2EMu
/
EQ2
/
source
/
depends
/
boost_1_72_0
/
libs
/
outcome
/
doc
/
html
/
tutorial
/
advanced
/
interop
/
conclusion.html

conclusion.html 2.6 KB
History Raw

1234567891011121314151617181920212223242526272829303132333435363738 
  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    2. 

  2. <html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    3. 

  3. <title>Conclusion - Boost.Outcome documentation</title>
    4. 

  4. <link rel="stylesheet" href="../../../css/boost.css" type="text/css">
    5. 

  5. <meta name="generator" content="Hugo 0.52 with Boostdoc theme">
    6. 

  6. <meta name="viewport" content="width=device-width,initial-scale=1.0"/>
    7. 

  7. 

  8. <link rel="icon" href="../../../images/favicon.ico" type="image/ico"/>
    9. 

  9. <body><div class="spirit-nav">
    10. 

  10. <a accesskey="p" href="../../../tutorial/advanced/interop/app-go.html"><img src="../../../images/prev.png" alt="Prev"></a>
    11. 

  11.     <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
    12. 

  12.     <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../recipes.html"><img src="../../../images/next.png" alt="Next"></a></div><div id="content">
    13. 

  13.   <div class="titlepage"><div><div><h1 style="clear: both">Conclusion</h1></div></div></div>
    14. 

  14.   <p>This worked example was in fact excessively complex: a quicker route
    15. 

  15. to achieving the same thing would be to add explicit converting constructors
    16. 

  16. to <code>app::error_code</code> for each of the third party library <code>E</code> types.
    17. 

  17. One then could have saved oneself with having to bother injecting
    18. 

  18. custom converters into the <code>BOOST_OUTCOME_V2_NAMESPACE::convert</code> namespace.
    19. 

  19. If you control your application&rsquo;s <code>E</code> type, then that is probably a
    20. 

  20. better, and certainly simpler, approach.</p>
    21. 

  21. 

  22. <p>However there are occasions when you don&rsquo;t have control over the
    23. 

  23. implementation of the destination <code>E</code> type e.g. in callbacks. Outcome&rsquo;s <code>ValueOrError</code>
    24. 

  24. infrastructure lets you inject custom interop code for any pair
    25. 

  25. of incommensurate third party <code>E</code> types, without needing to modify either&rsquo;s
    26. 

  26. source code.</p>
    27. 

  27. 

  28. <p>This is without doubt a &ldquo;power users&rdquo; feature, but
    29. 

  29. one which will prove useful as <code>T|E</code> based C++ code proliferates.</p>
    30. 

  30. 

  31. 

  32.         </div><p><small>Last revised: February 11, 2019 at 13:38:04 UTC</small></p>
    33. 

  33. <hr>
    34. 

  34. <div class="spirit-nav">
    35. 

  35. <a accesskey="p" href="../../../tutorial/advanced/interop/app-go.html"><img src="../../../images/prev.png" alt="Prev"></a>
    36. 

  36.     <a accesskey="u" href="../../../tutorial/advanced/interop.html"><img src="../../../images/up.png" alt="Up"></a>
    37. 

  37.     <a accesskey="h" href="../../../index.html"><img src="../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../../recipes.html"><img src="../../../images/next.png" alt="Next"></a></div></body>
    38. 

  38. </html>
    39.